JPY Uber Eats gift card worked!
It worked! Submitting my ID was annoying, and the website wasn't clear about that part, I just got an email about it that said it couldn't go through until I did...That was all kinda sus to be honest. But it was relatively painless, and I had the working giftcard code within 15-20 minutes! (Definitely wasn't 1-3 minutes as advertised, but it worked at least.) Unless I can find a better method, I'll probably use this service again.